| Autor: |
B. Arad, J.F. Boulter, William V. Prestwich |
| Rok vydání: |
1970 |
| Předmět: |
|
| Zdroj: |
Nuclear Instruments and Methods. 83:29-34 |
| ISSN: |
0029-554X |
| DOI: |
10.1016/0029-554x(70)90529-x |
| Popis: |
A delayed coincidence technique for measuring nuclear lifetimes in the range of 100 ps is described. The start-stop time interval is recorded along with the stop energy in a two parameter array S ( E , t ) and the shape of the centroid-energy function 〈 S ( E , t )〉 in the prompt region of the spectrum is determined and extrapolated to the delayed region in order to obtain the centroid shift. The lifetime of the 31.2 keV level in 28 Al −T 1 2 = 2.15±0.06 ns and of the 279 keV level in 203 Tl − T 1 2 = 282±15 ps have been measured using this method. As a more direct verification of the technique, a source was displaced through measured distances relative to a second fixed source and the observed centroid shifts compared to the values predicted using the speed of light. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
